package com.szholly.utils.freemarker.directive;

import java.io.IOException;
import java.io.Writer;
import java.util.Map;

import org.springframework.stereotype.Component;

import com.szholly.utils.spring.springmvc.route.FunctionInfo;
import com.szholly.utils.util.StringUtils;

import freemarker.core.Environment;
import freemarker.template.TemplateDirectiveBody;
import freemarker.template.TemplateDirectiveModel;
import freemarker.template.TemplateException;
import freemarker.template.TemplateModel;

/**
 * HTML文本提取并截断
 */
@Component("directive_htmlcut")
public class HtmlCutDirective implements TemplateDirectiveModel, IDirective  {
	
	public static final String PARAM_S = "s";
	public static final String PARAM_LEN = "len";
	public static final String PARAM_APPEND = "append";

	@SuppressWarnings({ "unchecked", "rawtypes" })
	public void execute(Environment env, Map params, TemplateModel[] loopVars,
			TemplateDirectiveBody body) throws TemplateException, IOException {
		String s = DirectiveUtils.getString(PARAM_S, params);
		Integer len = DirectiveUtils.getInt(PARAM_LEN, params);
		String append = DirectiveUtils.getString(PARAM_APPEND, params);
		if (s != null) {
			Writer out = env.getOut();
			if (len != null) {
				out.append(StringUtils.htmlCut(s, len, append));
			} else {
				out.append(s);
			}
		}
	}

	@Override
	public FunctionInfo getFunctionInfo() {
		String paraInfo = "s����Ҫ������ı� <br/>len����󳤶�<br/>append������ȵĲ����ַ�";
		FunctionInfo info = new FunctionInfo("htmlcut", 1, "ͨ��",
				"HTML�ı���ȡ���ض�", paraInfo);
		return info;
	}
}
